Final answer:
It is recommended that a client be cleared for exercise by a physician for at least 2 weeks before starting a new exercise program.
Step-by-step explanation:
The maximum number of weeks that a client should be cleared for exercise by a physician before working with a trainer can vary depending on the individual's health status and any specific concerns. However, in general, it is recommended that a client be cleared for exercise by a physician for at least 2 weeks before starting a new exercise program. This allows the physician to assess the client's overall health and any potential risks or limitations.